[KyleSeal]

Update;

Still no pressure at the rear wheel cylinders, no amount of two person bleeding nor pressure bleeding really yields me any more fluid than the other.

I have check a few things;
Fittings at master for flow when the pressure bleeder is on - good
Fittings at the proportioning valve when the pressure bleeder is on - good
Fittings at first union when pressure bleeder is on - good (both sides of union)
Fitting at the hard line to soft hose when pressure bleeder is on - good
Fittings at the tee for the rear end distribution when pressure bleeder is on - passenger side - little to no flow -- driver side, good
Fitting at wheel cylinder on passenger side - no flow
I cannot check the fitting at the driver side wheel cylinder as the nut is rounded, but no flow at bleeder. Even removing the bleeder from both sides on the rear end, virtually no fluid comes out.

My only conclusion is I have some incredible blockage here, maybe the soft line failing from being unused for so many years? I really dont know.
I may just buy a new soft line & tee, with new rear hard lines just in case for this weekend when I continue deeper.

Though this is super discouraging, I really want this truck on the road.
and on we go